Method of making lubricating-oils



UNITED STATES PATENT OFFICE.

LEWIS S. EASTLAKE, OF CHICAGO, ILLINOIS.

METHOD OF MAKING LUBRICATING-OILS.

No Drawing.

To all whom it may concern:

, Be it known that I, LEWIS S. EASTLAKE, a citizen of the United States,and a resident of the city of Chicago, county of Cook, and State ofIllinois, have invented certain new and useful Improvements in Methodsof Making Lubricating-Oils, of which the following is a specification.

My invention relates to improvements in methods of making lubricatingoils, and has for its object the provision of an improved method forthis purpose whereby the waste or residue of ordinary lubricating oilsmay be utilized for making new oils.

The invention consists in the method hereinafter set forth and claimed.

The preferred method of procedure consists in collecting the ordinarywaste residue of lubricating oil, such as is left in the crank case ofan ordinary gasolene engine, and which is usually thrown away. Thisspent residue consists substantially of the solvent portion of the oilfrom which practically all the lubricating portion has been exhausted.The solid matter, such as the carbon and other impurities is removedfromthis residue preferably by filtration, as through a combined feltand paper filter, although this solid matter might perhaps be removed byprecipitation or by the use of centrifugal force. Then a suitable amountof lubricating element such as ordinary petrolatum or Vaseline is mixedwith this claritied residue, thus providing fresh lubricating oil, whichto all intents and purposes is as good as the original oil forlubricating purposes. To effect this mixture, the petrolatum or Vaselineis preferably heated until it becomes quite liquid and then is mixedwith the clarified residue by stirring. To obtain a medium heavy oil Iadd about one pound of the petrolatum to one gallon of the clarifiedresidue. If the proportion of petrolatum is increased a heavier oil maybe produced, or if decreased a lighter oil produced, so that thecharacter of the lubricating oil produced may be varied as desired.

The lubricating oils thus produced are to all intents and purposes asgood for lubricating purposes as was the original oil from which theresidue is obtained. Inasmuch as Specification of Letters Patent.

Application filed December 7, 1917; Serial No. 205.948.

this residue is ordinarily thrown away as of no further use, and thepetrolatum or vaseline costs but little, lubricating oils may beproduced by this process with great economy.

\Vhile I have set forth the preferred methods of procedure for carryingthe invention into effect, these are capable of variation andmodification without departing form the spirit of the invention. I,therefore, do not wish to be limited to the precise steps and proportionof parts set forth, but desire to avail myself of such variations andmodifications as come within the scope of the appended claims.

Having described my invention what I claim as new and desire to secureby Letters Patent is:

1. The method of making lubricating oils which consists in mixing alubricating element substantially free of solvents with the spentresidue of used lubricating oil, substantially as described.

2. The method of making lubricating oils which consists in mixingpetrolatum with y the spent residue of used lubricating oil,substantially as described.

3. The method of making lubricating oils which consists in saving thespent residue of used lubricating oil; removing solid matter therefrom;and then mixing a lubricating element substantially free of solventstherewith, substantially as described.

4. The method of making lubricating oils which consists in saving thespent residue of used lubricating oil; removing solid matter therefrom;and then mixing petrolatum therewith, substantially as des ribed.

5. The method of making lubricating oils which consists in filtering thespent residue of used lubricating oil; and then mixing a lubricatingelement substantially free of solvents therewith, substantially asdescribed.

6. The method of making lubricating oils which consists in filtering thespent residue of used lubricating oil; and then heating and mixing alubricating element substantially free of solvents therewith,substantially as described.

7. The method of making lubricating oils which consists in filtering thespent residue of used lubricating oil; and then mixing petrolatumtherewith, substantially as de- In testimony whereof I have signed myscribed. name to this specification in the presence of 8. The method ofmaking lubricating oils two subscribing witnesses.

which consists in filtering the spent residue LEWIS S. EASTLAKE.

of used lubricating oil; and then heating WVitnesses:

and mixing petrolatum therewith, substan- JOSHUA R. H. Poms,

tially as described. 13. G. RICHARDS.

